How do our eyes “get used to the dark”?
In: Biology
The pupil opening is a minor contribution to the overall adjustment, allowing for about a factor of 10 improvement in low light visibility.
The rest of the improvement in night vision is done chemically, by regeneration of photopigments, which increases the sensitivity of the retina, by between 10,000 and 1000,000 times
If you are familiar with cameras, the pupil dilation is like opening up the aperture.
The increased retina sensitivity is like increasing the ISO (but with a huge ISO range available)
[This is the Wikipedia article ](https://en.m.wikipedia.org/wiki/Adaptation_(eye)) that discusses eye adaptation
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